Max distance between nozzles on horizontal vessel 1

[TexasEng]

How can I determine the maximum distance between two nozzles on a horizontal vessel allowed by code?
1800mm inside diameter with 20mm wt.

 

[roca]

Que?
There is no maximum in the code.
The maximum will depend on the physical size of the vessel and nozzles and where your connectiing pipework is.

 

[gr2vessels]

For the minimum distance between adjacent nozzles, refer ASME VIII Div.1, Clause UG-42(b) and (c).
However, if I read correctly, you are Texas Engineer, hence you're looking for the biggest possible distance between nozzles;- the code does not restrict the distance between nozzles, other than practical limits, like border line between Texas and the neighbouring countries. It also depends of the size/length of your vessel, the available plant plot. If you need to locate the nozzles on the shell of a horizontal vessel, you could place them at the opposite ends of the vessel, better still one in the top, the other on the bottom. I suggest to keep some 1.25-1.5" distance between the nozzle weld and the dished end's circ weld (please note that you can override this advice in some circumstances and weld the nozzle on the head circumferential weld, to extend the distance with a hefty 2.5" or even cross the weld into the dished end straight flange area, if applicable).
I would also suggest to have another look at your post and try to re-phrase your question, since it sounds a bit funny.
cheers,
gr2vessels

 

[TexasEng]

Apologize for the confusing question. What is the maximum level range that can be measured using nozzles protruding horizontal out the side of the vessel? What's the max distance between the center of the two nozzles?

 

[roca]

Depends on the design code.

 

[TexasEng]

British Standard 5500. Is there a difference if ASME VIII is used?

 

[roca]

Yes
BS 5500 - Para 3.5.4.2 b.
2) Oblique nozzles
The nozzle shall be of circular cross-section and the angle between the axis of the nozzle and a line
normal to the shell surface shall not exceed 50°.

As far as I am aware ASME VII has no limit and will accept tangential (hillside) nozzles

I'm sure someone will correct me if I'm wrong

 

[gr2vessels]

Texas, you can use elbow nozzle necks, perpendicular to the shell and horizontal ends, having any suitable distance between the nozzle flanges centreline;- you can use right angle elbows welded in top and bottom of your vessel, with flanges welded in the end of horizontal section...all this in accordance with PD5500, ASME VIII, AS1210, etc....
cheers,
gr2vessels